Explosive Shockwave

As an additional cost to this spell, you may sacrifice any number of creature and/or planeswalkers
For each player, that player distributes X damage among creatures and/or planeswalkers that player controls, where X for you is X minus the number of creatures and/or planeswalkers you sacrificed, and X for other players is X plus the number of creature and/or planeswalkers you sacrificed. If an opponent has any excess damage, that damage is dealt to that player.